These are Some Articles I thought were interesting. It is also an example of broad searching. I went to some core Think tanks and Searched "Iraq." Not only is there a ton of good stuff, but looking around Big cites/think tanks gives you an idea of the core Negative Case arguments against you.

RAND Reports and Commentary (Middle of the Road) – Some are book Length and Some are Commentary – Work on SKIMMING the super long stuff for cards

http://www.rand.org/pubs/monographs/MG892/

http://www.rand.org/pubs/monographs/MG911/

http://www.rand.org/pubs/occasional_papers/OP272/

http://www.rand.org/pubs/monographs/MG882/

http://www.rand.org/commentary/2009/03/05/PS.html

http://www.rand.org/commentary/2008/12/16/NJ.html

CATO
http://www.cato.org/pubs/handbook/hb111/hb111-49.pdf

http://www.cato.org/pub_display.php?pub_id=7424

http://www.cato.org/pub_display.php?pub_id=11890

http://www.cato.org/pub_display.php?pub_id=11658

http://www.cato.org/pub_display.php?pub_id=11181

Center For American Progress

http://www.americanprogress.org/issues/2009/03/standoff_in_baghdad.html

http://www.americanprogress.org/issues/2009/02/promised_withdrawal.html

http://www.americanprogress.org/issues/2010/04/tricky_timelines.html

http://www.americanprogress.org/issues/2007/06/strategic_reset.html

http://www.americanprogress.org/issues/2008/08/how_to_redeploy.html

http://www.americanprogress.org/issues/2010/04/uncertain_outcomes.html

http://www.americanprogress.org/issues/2009/12/uneven_progress.html

http://www.americanprogress.org/issues/2009/07/advising_training_iraq.html

Atlantic Council

http://www.acus.org/new_atlanticist/iraq-deadline

http://www.acus.org/new_atlanticist/obamas-iraq-policy-must-be-focused-more-withdrawal

CSIS

http://csis.org/files/media/csis/pubs/080607_iraq-strategicpatience.pdf - Great Iraq k2 heg ccard

http://www.nytimes.com/2010/04/14/world/middleeast/14security.html?_r=1

http://csis.org/publication/iraq-and-united-states

http://csis.org/publication/iraq-after-election

http://csis.org/publication/iraqi-elections-and-beyond-hope-best-plan-something-less

http://csis.org/publication/past-failures-and-future-transitions-iraqi-reconstruciton

http://csis.org/publication/recent-trends-iraq-war

http://csis.org/publication/iraq-security-trends

http://csis.org/publication/iraq-security-and-challenges-lasting-victory

http://csis.org/publication/withdrawal-iraq-0

http://csis.org/publication/iraq-time-stay

http://csis.org/publication/how-soon-safe

http://csis.org/publication/impending-withdrawal-iraq-and-its-implications

CFR

http://www.cfr.org/publication/22651/squandered_opportunity.html?breadcrumb=%2Fregion%2F397%2Fmiddle_east

http://www.cfr.org/publication/22417/iraqs_slow_steady_political_progress.html?breadcrumb=%2Fregion%2F405%2Firaq

http://www.cfr.org/publication/22084/malikis_actions_and_obamas_inaction_threaten_an_iraq_democracy.html?breadcrumb=%2Fregion%2F405%2Firaq

http://www.cfr.org/publication/21996/iraqs_gathering_political_clouds.html?breadcrumb=%2Fregion%2Fpublication_list%3Fid%3D405

http://www.cfr.org/publication/21842/iraq.html?breadcrumb=%2Fregion%2Fpublication_list%3Fid%3D405

http://www.cfr.org/publication/21699/iraq_update.html?breadcrumb=%2Fregion%2Fpublication_list%3Fid%3D405%26page%3D2

http://www.cfr.org/publication/21577/no_place_like_home.html?breadcrumb=%2Fregion%2Fpublication_list%3Fid%3D405%26page%3D2